Super Pro Era Fingers

[Dan Beller-McKenna]

In Sho-Bud Super Pro type changers, are the fingers on a Pro III identical to those on the Super Pro and Pro II? I realize that there are different eras within the Super Pro period, with longer or shorter triangular extensions to the lowering plate that holds the return spring across all models. But that aside, are the fingers on the Pro III (or other models custom ordered with aluminum necks) unique, given the different mounting of the changer on aluminum neck guitars?